MODELLING TEST ON THE MECHANICAL PROPERTIES OF PRE-STRESSED LATTICE FRAMED ANCHOR STRUCTURE
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摘要: 格构锚固是边(滑)坡工程常用的防治技术之一,为了研究格构锚固结构实际支挡碎石土边坡的受力特征,利用现场大比例尺物理模型试验,填筑粘土方式模拟滑坡体,设计相似比为1:2.5的格构梁,通过后缘加载模拟了格构锚固体系承载受力直至失稳破坏的全过程,监控格构梁后部土压力、格梁应力、格梁位移等参数,并分析了格构梁受力、位移特征和变形破坏模式。结果表明:格构边界处锚固点处变形较内部更为明显,跨梁呈"拱桥式"变形,最终在锚固点附近折断破坏;各横纵梁受力特征类同,梁交叉锚固点处应力集中,梁中部受力最小,应力呈近倒三角形分布;模型中锚固点受力和位移自顶到底呈现线性递减的应力分配现象。上述研究可以为工程优化设计提供一定参考。Abstract: Lattice anchoring is one of the frequently used prevention technologies for slope and landslide engineering. A large-scale physical model test was adopted to explore the interaction of actual mechanics characteristics of lattice frame anchorage in the detritus soil slope. Using the compacted clay filling the indoor model experiment groove to simulate the landslide mass, and designing the lattice beams with the ratio of similitude 1:2.5, which revealed the whole deformation process in lattice beams of pre-stressed lattice anchorage system under the action of pre-stress, we monitored parameters of the soil pressure, stress of lattice and displacement of lattice. On the basis of analysis about stress-strain data and deformation signs, the following results are obtained:The deformation of the anchor points at the boundary of the lattice were more obvious than those of the interior, and also fractured nearby, in addition, the shape of deformed cross-beam was just like an arch bridge; The stress on each beam was near the inverted triangle distribution which was maximum at the beam crossing points; The stress distribution of the anchor points was linearly decreasing from the top to the bottom. The above research could provide some reference for engineering optimization design.
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表 1 岩土体材料参数表
Table 1. Rock and soil material parameters
模型材料 容重γ/(kN/m3) 抗剪强度 弹性模E/Mpa 泊松比v 内聚力C/kN 内摩擦角φ/(°) 碎石土 22.5 12.0 23.5 25.0 0.30 砂岩 23.0 10.0 21.5 23.5 0.40 表 2 H1—H4横梁在加载63 T时受力数据表
Table 2. H1 to H4 beam' s mechanical data table at the load of 63 T
横梁受力变化情况/kPa 加载63 T后 H1-1 H1-2 H1-3 H1-4 H1-5 1575 3126 3263 3710 3113 H2-1 H2-2 H2-3 H2-4 910 300 1400 750 H3-1 H3-2 H3-3 H3-4 780 510 800 580 H4-1 H4-2 H4-3 H4-4 280 110 700 410 -
[1] 田尤, 杨为民, 黄晓, 等.天水市麦积区幅黄土滑坡发育分布特征及其孕灾因素分析[J].地质力学学报, 2016, 22(1):25~38. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20160103&journal_id=dzlxxbTIAN You, YANG Weimin, HUANG Xiao, et al. Distribution characteristics and inducing factors of loess landslide in Maiji mappable unit, Tianshui[J]. Journal of Geomechanics, 2016, 22(1):25~38. (in Chinese with English abstract) http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20160103&journal_id=dzlxxb [2] 吴礼舟, 李部, 孙萍.甘肃甘谷裂隙泥岩剪切蠕变行为及其修正模型研究[J].地质力学学报, 2017, 23(6):923~934. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20170613&journal_id=dzlxxbWU Lizhou, LI Bu, SUN Ping. Study on shear creep behavior of mudstone and its correction model of Gangu fissure in Gansu[J]. Journal of Geomechanics, 2017, 23(6):923~934. (in Chinese with English abstract) http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20170613&journal_id=dzlxxb [3] 胡时友.框格护坡技术的新进展[J].西部探矿工程, 1999, 11(4):111~114. http://www.cnki.com.cn/Article/CJFDTotal-KYKB201506048.htmHU Shiyou. New progress of latticework slope protecting technology[J]. West-China Exploration Engineering, 1999, 11(4):114~114. (in Chinese with English abstract) http://www.cnki.com.cn/Article/CJFDTotal-KYKB201506048.htm [4] 陈春利, 殷跃平, 门玉明, 等.全长黏结注浆格构锚固工程模型试验研究[J].岩石力学与工程学报, 2017, 36(4):881~889. http://www.cnki.com.cn/Article/CJFDTOTAL-DALI200706004.htmCHEN Chunli, YIN Yueping, MEN Yuming, et al. Model test on fully grouted lattice beam anchorage[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(4):881~889. (in Chinese with English abstract) http://www.cnki.com.cn/Article/CJFDTOTAL-DALI200706004.htm [5] 周志刚. 预应力锚索格构梁加固边坡的优化设计及安全系数计算[D]. 杭州: 浙江大学, 2011. http://cdmd.cnki.com.cn/Article/CDMD-10335-1011204164.htmZHOU Zhigang. Optimization design and safety factor calculation of the slopes reinforced by pre-stressed anchors and lattice beams[D]. Hangzhou: Zhejiang University, 2011. (in Chinese with English abstract) http://cdmd.cnki.com.cn/Article/CDMD-10335-1011204164.htm [6] Nambu H, Noguchi Y, Saitoh K, et al. Nearly nondiffracting electron lattice beams generated by polygonal slits[J]. Microscopy, 2017, 66(4):295~299. doi: 10.1093/jmicro/dfx020 [7] Shi Z W, Xu Y T, Li Y, et al. Propagation of an Airy-Gaussian vortex beam in defected photonic lattices[J]. Optik-International Journal for Light and Electron Optics, 2017, 142:370~375. doi: 10.1016/j.ijleo.2017.06.006 [8] 郑颖人, 张玉芳, 赵尚毅, 等.有限元强度折减法在元磨高速公路高边坡工程中的应用[J].岩石力学与工程学报, 2005, 24(21):3812~3817. doi: 10.3321/j.issn:1000-6915.2005.21.002ZHENG Yingren, ZHANG Yufang, ZHAO Shangyi, et al. Application of strength reduction Fem to Yuanjiang-mohei expressway cut slope stability analysis[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(21):3812~3817. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2005.21.002 [9] 张涛, 石胜伟, 谢忠胜, 等.格构锚固体系梁下土体反力分布规律的试验研究[J].水文地质工程地质, 2014, 41(3):70~75. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=swdzgcdz201403012ZHANG Tao, SHI Shengwei, XIE Zhongsheng, et al. Model test study of the soil anti-force distribution rule under the beams of a frame anchorage system[J]. Hydrogeology & Engineering Geology, 2014, 41(3):70~75. (in Chinese with English abstract) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=swdzgcdz201403012 [10] 韩冬冬, 门玉明, 刘璐.预应力格构锚固体系格构梁内力分布规律模型试验研究[J].岩石力学与工程学报, 2015, 34(8):1619~1627. http://www.cnki.com.cn/Article/CJFDTotal-SWDG201502011.htmHAN Dongdong, MEN Yunming, LIU Lu. Modelling test on internal force distribution in lattice beams of prestressed lattice anchoring system[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34(8):1619~1627. (in Chinese with English abstract) http://www.cnki.com.cn/Article/CJFDTotal-SWDG201502011.htm [11] 许英姿, 唐辉明.滑坡治理中格构锚固结构的解析解分析[J].地质科技情报, 2002, 21(3):89~93. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dzkjqb200203017XU Yingzi, TANG Huiming. Analysis on analytic solution of lattice frame anchor structure of landslide control[J]. Geological Science and Technology Information, 2002, 21(3):89~93. (in Chinese with English abstract) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=dzkjqb200203017 [12] 殷跃平.滑坡钢筋砼格构防治"倒梁法"内力计算研究[J].水文地质工程地质, 2005, 32(6):52~56. http://mall.cnki.net/magazine/Article/SWDG200506008.htmYIN Yueping. Internal force analysis on steel Concrete lattice by reverse beam method for landslide control[J]. Hydrogeology & Engineering Geology, 2005, 32(6):52~56. (in Chinese with English abstract) http://mall.cnki.net/magazine/Article/SWDG200506008.htm [13] 李德芳, 张友良, 陈从新.边坡加固中预应力锚索地梁内力计算[J].岩土力学, 2000, 21(2):170~172. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=ytlx200002019LI Defang, ZHANG Youliang, CHEN Congxin. Design of prestressed-cable sommer for slope-reinforcing engineering[J]. Rock and Soil Mechanics, 2000, 21(2):170~172. (in Chinese with English abstract) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=ytlx200002019 [14] 赵晓彦, 黄金河, 周一文, 等.坡面锚索与坡脚抗滑桩联合加固边坡设计方法[J].西南交通大学学报, 2017, 52(3):489~495. http://manu19.magtech.com.cn/Jweb_xnjd/CN/abstract/abstract12430.shtmlZHAO Xiaoyan, HUANG Jinhe, ZHOU Yiwen, et al. Joint reinforcement design method of tieback anchors on slope surface and anti-slide piles at slope toe[J]. Journal of Southwest Jiaotong University, 2017, 52(3):489~495. (in Chinese with English abstract) http://manu19.magtech.com.cn/Jweb_xnjd/CN/abstract/abstract12430.shtml [15] 曹瑞琅, 王玉杰, 皮进, 等.无粘结环锚预应力衬砌锚具槽布置方式对比研究[J].水利水电技术, 2017, 48(7):59~63. http://cdmd.cnki.com.cn/Article/CDMD-10056-1015018143.htmCAO Ruilang, WANG Yujie, PI Jin, et al.Comparative study on layout patterns of anchorage slots for pre-stressed lining with unbonded circular anchored tendons[J]. Water Resources and Hydropower Engineering, 2017, 48(7):59~63. (in Chinese with English abstract) http://cdmd.cnki.com.cn/Article/CDMD-10056-1015018143.htm [16] 李萌, 李守义, 程帅, 等.中墩锚块底部接触方式和锚索优化研究[J].水利水电技术, 2016, 47(12):43~47. http://www.cnki.com.cn/Article/CJFDTOTAL-ZNSD200812037.htmLI Meng, LI Shouyi, CHENG Shuai, et al. Optimal study on contact mode of bottom anchor-block and anchor cable of central pier[J]. Water Resources and Hydropower Engineering, 2016, 47(12):43~47. (in Chinese with English abstract) http://www.cnki.com.cn/Article/CJFDTOTAL-ZNSD200812037.htm